Q.

AlF63- exists, while BF63- does not. Choose the most appropriate reason.

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a

Boron is smaller in size

b

Boron cannot expand it valence shell

c

Aluminium shows variable valency

d

Aluminium is more electropositive

answer is B.

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Detailed Solution

All the options except (c) are correct but the most appropriate reason is that boron cannot expand its valence shell and its maximum valency is limited to 4. While Al can expand its valence shell and hence can form AlF63-.
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AlF63- exists, while BF63- does not. Choose the most appropriate reason.